The things most people get wrong about WETT Inspections.
WETT = Wood Energy Technology Transfer Inc.
1. I can get my wood stove "WETT Certified"
WETT is a training organization. They provide courses and exams for people involved in selling, installing or inspecting wood-burning appliances. These courses help people to acquire knowledge and improve their skills. People can be WETT Certified, but appliances and systems cannot.
2. My system is certified, so I don't need a WETT inspection
There are agencies such as ULC or CSA that certify appliances and system components. This certification is only valid if all the components are installed per the manufacturer's instructions, and in accordance with all local laws and fire codes. For example: someone could buy a certified appliance, but install it incorrectly. A WETT inspection ensures that the system was installed correctly, and that it is fit for use.
3. I can fail a WETT inspection
While a WETT inspection is technically a code-compliance inspection, there is no pass/fail verdict given. The inspector determines if an appliance or system is compliant with installation guidelines and codes, or if there is any evidence of problems with the system, and present those findings. For obtaining insurance, the insurer is ultimately the one who decides if they will issue fire coverage for the use of the appliance based on the findings of the inspection.
4. I get a WETT Certificate
There is no such thing as a "WETT Certificate". After your inspection you will receive a copy of the inspection report, which you may need to pass on to your insurer. This report outlines which parts of the installation are code compliant (or not), and if there is evidence of any issues with the system.
5. I only need my appliance inspected once
Things can change over time. Mortar and brick can crack and crumble, metal can warp and twist, gaskets can fail, and creosote can build up. Because of this, many insurers require WETT inspections to be conducted on a regular basis (every few years) to ensure that the system is still suitable for use.
Key Points
WETT is a training organization - it only certifies people.
A system may be certified by a listing agency, but it can still be improperly installed or defective.
There is no pass/fail on a WETT inspection.
There is no such thing as a "WETT Certificate".
You may need to have your system inspected every few years.